<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Behavior;

/**
 * 机器人检测
 * 
 * @author liu21st <liu21st@gmail.com>
 */
class RobotCheckBehavior {
	public function run(&$params) {
		// 机器人访问检测
		if (C ( 'LIMIT_ROBOT_VISIT', null, true ) && self::isRobot ()) {
			// 禁止机器人访问
			exit ( 'Access Denied' );
		}
	}
	static private function isRobot() {
		static $_robot = null;
		if (is_null ( $_robot )) {
			$spiders = 'Bot|Crawl|Spider|slurp|sohu-search|lycos|robozilla';
			$browsers = 'MSIE|Netscape|Opera|Konqueror|Mozilla';
			if (preg_match ( "/($browsers)/", $_SERVER ['HTTP_USER_AGENT'] )) {
				$_robot = false;
			} elseif (preg_match ( "/($spiders)/", $_SERVER ['HTTP_USER_AGENT'] )) {
				$_robot = true;
			} else {
				$_robot = false;
			}
		}
		return $_robot;
	}
}